So are you saying the 436 hp cannot just be programmed manually or by computer? Only by using the zip code load up? Because of the sd card?
You can set up your own custom favorite lists on the 436 & 536 via Sentinel to scan as much or as little as you want (check the ZIP file in my signature link - I have hundreds of people that use my custom FL's instead of the raw DB).
Trying to create a custom FL through the keypad on these units will be an absolute exercise in futility. It can be done, but you'll end up banging you head against the wall!
I love that I can initiate a 'quick search' on a specific frequency in about 5 seconds via the keypad & the unit will decode anything it hears automatically (PL, DPL, P25, DMR, etc...).